Polish mobile message actions (#5873)

## Summary

- Add a lifted-message long-press popover with the reaction tray and
grouped actions.
- Use a native action surface
- Preserve taps and scrolling, exclude attached reactions from the
lifted preview, and align the composition to the bottom safe area.
<img width="1080" height="2424" alt="Screenshot_20260814-160732"
src="https://github.com/user-attachments/assets/a9d5fc91-4ee3-427c-8199-1c3be2b4e98a"
/>

## Testing

- `bin/just mobile-check`
- `flutter test test/features/channels/message_actions_test.dart`
- `flutter test` (1,364 tests)
- Manual interaction review on iPhone and Pixel 10

---------

Signed-off-by: kenny lopez <klopez4212@gmail.com>
Signed-off-by: Kenny Lopez <klopez4212@gmail.com>
Signed-off-by: Princess Donut <b238ea756dee4d98afa5883fc7f1de61eeabe65bf700e3a5a5a80db5e42e2c2b@buzz.block.builderlab.xyz>
Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Princess Donut <b238ea756dee4d98afa5883fc7f1de61eeabe65bf700e3a5a5a80db5e42e2c2b@buzz.block.builderlab.xyz>
Co-authored-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>

mobile/ios/Runner/AppDelegate.swift

@@ -10,6 +10,7 @@ import UserNotifications
   private var inlinePhotoPickerSupportChannel: FlutterMethodChannel?
   private var concentricSheetSurfaceChannel: FlutterMethodChannel?
   private var nativeAttachmentPopoverCoordinator: NativeAttachmentPopoverCoordinator?
+  private var nativeMessageActionSurfaceSupportChannel: FlutterMethodChannel?
 
   override func application(
     _ application: UIApplication,
@@ -113,6 +114,27 @@ import UserNotifications
       messenger: messenger,
       parentViewController: nativeAttachmentRegistrar?.viewController
     )
+
+    if #available(iOS 16.0, *),
+      let nativeMessageActionsRegistrar = engineBridge.pluginRegistry.registrar(
+        forPlugin: "BuzzNativeMessageActionSurface"
+      ) {
+      nativeMessageActionsRegistrar.register(
+        NativeMessageActionSurfaceFactory(messenger: messenger),
+        withId: "buzz/native_message_action_surface"
+      )
+      nativeMessageActionSurfaceSupportChannel = FlutterMethodChannel(
+        name: "buzz/native_message_action_surface",
+        binaryMessenger: messenger
+      )
+      nativeMessageActionSurfaceSupportChannel?.setMethodCallHandler { call, result in
+        guard call.method == "isSupported" else {
+          result(FlutterMethodNotImplemented)
+          return
+        }
+        result(true)
+      }
+    }
   }
 
   private static func handleQrScannerMethodCall(